Abstract:Orius similis Zheng (Hemiptera: Anthocoridae) is an important predatory natural enemy in agro\|ecosystem in south of China. Its adults and nymphs can prey Aphis gossypii Glover, Frankliniella formosae, Tetranychus cinnabarinus, and the eggs or hatched larvae of Pectinophora gossypiella, Helicoverpa armigera and Anomis flava Fabricius and other pest of Lepidoptera, and it can also eat plant pollen. There has a large quantity of O. similis in cotton field, and it‘s a kind of natural enem...